If I could name the next Call of Duty, I'd call it "Call of Duty: Ghost Walker"

(Spoilers ahead.)

Because you know how the main character, Logan Walker, is captured by Rorke at the end of the campaign, and it is implied that Rorke will brainwash Logan into later killing the rest of the Ghosts? Well, the next game could take place like 10-15 years later when Hesh Walker is a Captain or something and is tasked with hunting down the infamous "Ghost Walker": a cold blooded murderer of the Ghosts. The campaign won't reveal who the "Ghost Walker" is until near the end, where Hesh confronts the killer and their brotherhood is revealed. People will need to play the campaign to figure out whether Hesh will be forced to kill his brother or somehow save him from the brainwashing.

I think it would be more of a surprise if the Ghost Walker wasn't Logan, Lol. Seriously, though. I think Ghost Walker would be too obvious. Hesh would think it was his brother throughout the whole story because he'd still have hopes that Logan was alive. I can see Hesh telling you and your guys not to kill him and the Walker taking out one or two of your guy's because of it. And then the captain of the squad you're in would be freaking out at Hesh because Hesh was responsible for the death of his men.

Alternate Ending: Hesh tells you to stand down and not kill Walker. If you listen, Logan gets a gun somehow and shoots you and then Hesh.

Another option would be to put him in a hold or something until reinforcements arrived, I don't know about that one though.

Last one is that you can kill the Walker right there, and watch Hesh pull the mask off of him. Here's the surprise part: it's not Logan. Hesh gets a look of confusion on his face as the sound of a gun clicking comes from behind the player. "That was a close one," the Walker would say. He then shoves the player to the ground and points the gun at Hesh. I don't know what he'd say there, either "Nighty, night, old pal" or "I sincerely apologize for this" and he'd shoot Hesh in the chest. He then points the gun at you, and he almost fires it. Someone would save you, possibly another character that you got to play as in the Campaign, or a player that seemed to die earlier. Like if Logan "killed" one of your squad mates. Bam. There's the endings I though of.

Yesss! This is exactly what I was thinking. I posted a thread about this earlier. Brother vs. brother, who will win? Kinda wonder what Logan's full voice actor will hopefully be. I thought i was the only one thinking about the Ghost 2 ( or whatever it will be called) and the brother vs. brother conflict until now.